ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 346

Question 1726

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How does the conservation of angular momentum apply to a freely rotating rigid body in space?

It slows down due to internal friction
It requires continuous torque
Its angular momentum remains constant if no external torque acts
It loses energy and stops

Question 1727

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What is the consequence of having zero net external torque on a system?

The system stops rotating
The angular velocity becomes zero
The total angular momentum is conserved
The moment of inertia increases

Question 1728

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In the expression τ = Σ r_i × F_i, what type of forces does F_i include?

Only gravitational forces
Only external forces
Only internal forces
Both external and internal forces

Question 1729

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What is the relationship between τ_ext and the time derivative of L?

τ_ext = L
τ_ext = d²L/dt²
τ_ext = 0
τ_ext = dL/dt

Question 1730

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Why is the assumption of central internal forces important in mechanics?

It increases kinetic energy
It causes expansion of the system
It ensures that internal torques cancel out
It simplifies mass calculation